Between brackets is the number of accepted species
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- Mollusca (133 306)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 081)
- Class Caudofoveata (143)
- Class Cephalopoda (1 921)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (103 047)
- Subclass Amphigastropoda † (434)
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (53 850)
- Subterclass Sorbeoconcha (147)
- Superorder Hypsogastropoda
- Order Architaenioglossa (4 921)
- Order Caenogastropoda incertae sedis (7 722)
- Order Littorinimorpha (17 232)
- Order Neogastropoda (23 828)
- Superfamily Buccinoidea Rafinesque, 1815 (5 270)
- Superfamily Cancellarioidea Forbes & Hanley, 1851 accepted as Volutoidea Rafinesque, 1815
- Superfamily Conoidea J. Fleming, 1822 (8 744)
- Superfamily Mitroidea Swainson, 1831 (634)
- Superfamily Muricacea accepted as Muricoidea Rafinesque, 1815
- Superfamily Muricoidea Rafinesque, 1815 (2 944)
- Superfamily Neogastropoda incertae sedis (1 151)
- Superfamily Olivoidea Latreille, 1825 (741)
- Superfamily Pholidotomoidea Cossmann, 1896 † (57)
- Superfamily Pseudolivoidea De Gregorio, 1880 accepted as Olivoidea Latreille, 1825
- Superfamily Pyrifusoidea Bandel & Dockery, 2001 † accepted as Pholidotomoidea Cossmann, 1896 †
- Superfamily Sarganoidea Stephenson, 1923 † accepted as Pholidotomoidea Cossmann, 1896 †
- Superfamily Toxoglossa Troschel, 1848 accepted as Conoidea J. Fleming, 1822
- Superfamily Turbinelloidea Swainson, 1835 (1 256)
- Superfamily Volutoidea Rafinesque, 1815 (3 031)
- Family Cystiscidae W. Stimpson, 1865 (557)
- Family Granulinidae G. A. Coovert & H. K. Coovert, 1995 (156)
- Family Marginellidae J. Fleming, 1828 (1 447)
- Family Marginellonidae Coan, 1965 (4)
- Family Paladmetidae Stephenson, 1941 † accepted as Admetinae Troschel, 1865
- Family Plesiocystiscidae G. A. Coovert & H. K. Coovert, 1995 accepted as Plesiocystiscinae G. A. Coovert & H. K. Coovert, 1995
- Family Volutidae Rafinesque, 1815 (867)
- Subfamily Amoriinae J. E. Gray, 1857 (170)
- Subfamily Athletinae Pilsbry & Olsson, 1954 (105)
- Subfamily Calliotectinae Pilsbry & Olsson, 1954 (22)
- Subfamily Cymbiinae H. Adams & A. Adams, 1853 (1847) (236)
- Tribe Adelomelonini Pilsbry & Olsson, 1954 (35)
- Tribe Alcithoini Pilsbry & Olsson, 1954 (60)
- Tribe Cymbiini H. Adams & A. Adams, 1853 (1847) (16)
- Tribe Livoniini Bail & Poppe, 2001 (38)
- Genus Cottonia Iredale, 1934 accepted as Livonia Gray, 1855
- Genus Ericusa H. Adams & A. Adams, 1858 (15)
- Genus Livonia Gray, 1855 (14)
- Species Livonia connudata Darragh, 1989 †
- Species Livonia gatliffi (Pritchard, 1898) †
- Species Livonia hannafordi (McCoy, 1866) †
- Species Livonia heptagonalis (Tate, 1889) †
- Species Livonia joerinkensi (Poppe, 1987)
- Species Livonia limpusi Bail, 1999
- Species Livonia mammilla (G. B. Sowerby I, 1844)
- Species Livonia mervcooperi Bail & Limpus, 2010
- Species Livonia mortoni (Tate, 1889) †
- Species Livonia nodiplicata (J. C. Cox, 1910)
- Species Livonia quisqualis Iredale, 1957 accepted as Livonia roadnightae (F. McCoy, 1881)
- Species Livonia roadnightae (F. McCoy, 1881)
- Subspecies Livonia roadnightae profunda Sprague, 2024
- Subspecies Livonia roadnightae roadnightae (F. McCoy, 1881)
- Species Livonia spenceri (Pritchard, 1896) †
- Species Livonia stephensi (R. M. Johnston, 1880) †
- Species Livonia voluminosa Darragh, 1989 †
- Genus Mamillana Crosse, 1871 accepted as Livonia Gray, 1855
- Genus Mesericusa Iredale, 1929 accepted as Ericusa H. Adams & A. Adams, 1858
- Genus Notopeplum H. J. Finlay, 1927 (9)
- Genus Pterospira G. F. Harris, 1897 † accepted as Livonia Gray, 1855
- Tribe Odontocymbiolini Clench & R. D. Turner, 1964 (22)
- Tribe Zidonini H. Adams & A. Adams, 1853 (65)
- Subfamily Cymbiolinae Bondarev, 1995 accepted as Melonini Pilsbry & Olsson, 1954
- Subfamily Eovolutinae Pacaud, 2016 † (25)
- Subfamily Fulgorariinae Pilsbry & Olsson, 1954 (57)
- Subfamily Indovolutinae Halder & S. S. Das, 2019 † (11)
- Subfamily Plicolivinae Bouchet, 1990 (2)
- Subfamily Scaphellinae Gray, 1857 (64)
- Subfamily Volutilithinae Pilsbry & Olsson, 1954 † (21)
- Subfamily Volutinae Rafinesque, 1815 (154)
- Subfamily Volutomitrinae J. E. Gray, 1854 accepted as Volutomitridae J. E. Gray, 1854
- Subfamily Zidoninae H. Adams & A. Adams, 1853 accepted as Zidonini H. Adams & A. Adams, 1853
- Genus Rostellites Conrad, 1855 †
- Genus Tectaplica Wade, 1916 †
- Order Stenoglossa accepted as Neogastropoda
- Subclass Gastropoda incertae sedis (313)
- Subclass Heterobranchia (39 231)
- Subclass Neomphaliones accepted as Vetigastropoda
- Subclass Neritimorpha (1 916)
- Subclass Orthogastropoda represented as Gastropoda
- Subclass Patellogastropoda (514)
- Subclass Prosobranchia
- Subclass Psilogastropoda represented as Gastropoda
- Subclass Vetigastropoda (6 789)
- Class Lamellibranchiata accepted as Bivalvia
- Class Loricata accepted as Polyplacophora
- Class Mollusca incertae sedis † (372)
- Class Monoplacophora (229)
- Class Pelecypoda accepted as Bivalvia
- Class Polyplacophora (1 381)
- Class Polyplaxiphora accepted as Polyplacophora
- Class Rostroconchia † (64)
- Class Scaphopoda (754)
- Class Solenoconchia accepted as Scaphopoda
- Class Solenogastres (313)
- Subclass Chaetodermomorpha accepted as Caudofoveata
